Bottom-mounted cam device

Abstract

The present invention provides a lower-mounted cam device for use in automotive press dies, which reduces the number of parts in the forced return mechanism and allows for appropriate setting of the machining angle and extrusion stroke to suit practical machining conditions. [Solution] The lower-mounted cam device 1 comprises a cam holder 100 attached to a lower die or pad, a sliding cam slider 200, and a cam driver 300 attached to an upper die. A forced return plate 302 having a first contact portion 302a is provided at the end of the cam driver, and a second contact portion 201a that can contact the first contact portion is formed on the cam slider body 201. When forced return is operated, both contact portions are brought into contact to apply a release force. Furthermore, as a device specification that is suitable for practical processing conditions, the processing angle is defined to be in the range of 50° to 85° and the extrusion stroke to be in the range of 16 mm to 23 mm. Conventionally, as a forced return mechanism for lower-mounted cam devices, a forced return mechanism has been proposed in which a member provided on the side or inside of the cam slider is brought into contact with a member on the cam driver side, but this has the problem of increasing the number of parts and the amount of work required for processing and assembly. In addition, a configuration that includes a forced return mechanism and defines the device including an extrusion stroke and processing angle range that is suitable for practical processing conditions has not been sufficiently shown.

Description

Technical Field

[0001] This utility model relates to a cam device installed in a press die for automobiles, and particularly to an under-mounted cam device.

Background Art

[0002] In a die for press-forming a metal plate of an automotive panel member, an under-mounted cam device attached to a lower die or a pad is used to perform hole machining or bending on the side surface simultaneously with forming. The pad is attached to the upper die and is a component provided so as to be movable in the vertical direction with respect to the fixed die, and holds a workpiece such as a panel material at a predetermined position by pressing it during forming. This type of under-mounted cam device includes a cam holder, a cam slider, and a cam driver, and has a configuration in which the cam slider is reciprocated in a predetermined direction by the operation of the upper die. In addition, in order to reliably return the cam slider to the initial position after processing, a configuration including a forced return mechanism in addition to an elastic member has been proposed. Furthermore, in the design of an under-mounted cam device, the relationship between the machining angle of the cam slider and the extrusion stroke is an important factor that affects the operating conditions of the device and the applicable machining conditions.

[0003] For example, Patent Document 1 discloses an under-mounted cam device including a forced return mechanism that applies a detachment force to the cam slider by bringing the plate member on the cam driver side into contact with the plate member on the cam slider side.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the forced return mechanism for the lower-mounted cam device described in Patent Document 1 is configured to assemble a contact member on the side or inside of the cam slider. As a result, the number of parts increases due to the addition of the contact member, and processing and assembly are required to attach the contact member to the cam slider body, which leads to the problem of increased processing and assembly time.

[0006] Furthermore, while the lower-mounted cam device requires setting the machining angle and extrusion stroke according to the mounting method to the lower die or pad and the machining conditions, a configuration that includes a forced return mechanism and specifies the device within a range of machining angles and extrusion strokes suitable for practical machining conditions has not been sufficiently demonstrated.

[0007] The present invention aims to reduce the man-hours required for machining and assembly, as well as to specify the device including the range of machining angle and extrusion stroke, in a lower-mounted cam device equipped with a forced return mechanism. [Means for solving the problem]

[0008] The lower-mounted cam device according to the present invention comprises a cam holder attached to a lower die or pad, a cam slider slidably positioned on the cam holder, and a cam driver attached to an upper die that drives the cam slider in the machining direction. A forced return plate having a first contact portion is provided at one end of the cam driver, and a second contact portion is formed on the cam slider body that can contact the first contact portion. During forced return operation, the first contact portion contacts the second contact portion, and a release force is applied to the cam slider via the second contact portion. The machining angle range of the lower-mounted cam device is 50° to 85°, and the extrusion stroke range is 16 mm to 23 mm.

[0009] In the bottom-mounted cam device according to the present invention, the maximum allowable processing force is 29.4kN or more and 44.1kN or less, the horizontal stroke range is 2.0mm or more and 10.3mm or less, and the press stroke range is 12.3mm or more and 22.9mm or less.

[0010] In the bottom-mounted cam device according to the present invention, the width of the cam slider is 60 mm, the length range of the cam holder mounting surface is 74 mm to 119 mm, and the height of the bottom-mounted cam device is 140 mm.

[0011] In the lower-mounted cam device according to the present invention, the mounting hole arrangement on the cam holder mounting surface is such that the front-to-back distance between the center point of the first counterbore hole and the center point of the third counterbore hole is 52 mm or more and 97 mm or less, the front-to-back distance between the center point of the second counterbore hole and the center point of the fourth counterbore hole is 52 mm or more and 97 mm or less, the left-to-right distance between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm, the left-to-right distance between the center point of the third counterbore hole and the center point of the fourth counterbore hole is 46 mm, the front-to-back distance from the rear end of the cam holder to the center points of the first and second counterbore holes is 14 mm, the front-to-back distance from the rear end of the cam holder to the center points of the first and second knock holes is 53 mm or more and 98 mm or less, and the left-to-right distance between the center point of the first knock hole and the center point of the second knock hole is 46 mm.

[0012] In the bottom-mounted cam device according to the present invention, the mounting hole arrangement on the cam driver mounting surface is such that the distance in the front-to-back direction between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm, the distance in the front-to-back direction from the rear end of the cam driver to the center point of the first counterbore hole is 12 mm, the distance in the front-to-back direction between the center point of the first knock hole and the center point of the second knock hole is 28 mm, and the distance in the front-to-back direction from the rear end of the cam driver to the center point of the first knock hole is 28 mm. [Effects of the Invention]

[0013] According to this invention, the number of parts in the forced return mechanism can be reduced, and a lower cam device can be provided that allows for appropriate setting of the machining angle and extrusion stroke to suit practical machining conditions. [Brief explanation of the drawing]

[0014] [Figure 1] This is an exploded perspective view of the lower-mounted cam device 1 of this embodiment. [Figure 2] This diagram shows the operation of the lower-mounted cam device 1 of this embodiment. [Figure 3]This diagram shows the relationships between the various forces in the bottom-mounted cam device of this embodiment. [Figure 4] This is a cam diagram of the bottom-mounted cam device of this embodiment. [Figure 5] This diagram shows the dimensions of the bottom-mounted cam device according to this embodiment. [Figure 6] This is a perspective view of the bottom-mounted cam device of this embodiment, with a width of 60 mm and a machining angle of 75°. [Modes for carrying out the invention]

[0015] Specific embodiments of this application will be described below with reference to the drawings and examples. Those skilled in the art will be able to clearly and fully understand the technical solution, the technical problem to be solved, and the technical effects to be achieved by this specification. The specific embodiments described herein are for illustrative purposes only and are not intended to be limiting. Furthermore, for the convenience of explanation, only the parts relevant to this application are shown in the drawings.

[0016] Furthermore, the structures, proportions, dimensions, etc., shown in the drawings of the specification are merely supplementary to the description of this specification and intended to assist those skilled in the art in understanding and interpreting it, and are not intended to limit the conditions for implementing this application. Therefore, they do not have any essential technical significance, and any modification of the structure, change in proportions, or adjustment of dimensions is considered to be within the scope of the technical content disclosed in this application, as long as it does not affect the effects and objectives that this application aims to achieve.

[0017] Furthermore, terms such as "first," "second," and "the" do not imply quantitative limitations and can be used in either singular or plural forms. In this application, "includes," "contains," "possesses," and their derivatives are intended to mean non-exclusive inclusion. That is, a process, method, system, product, or apparatus that includes a certain procedure or module is not limited to the listed procedures or elements, but may further include unlisted procedures or elements, or other procedures or elements inherent in the process, method, product, or apparatus. In addition, terms such as "connect," "link," and "join" are not limited to physical or mechanical connections, but also include direct or indirect electrical connections.

[0018] FIG. 1 is an exploded perspective view of the lower cam device 1 of the present embodiment. As shown in FIG. 1, the lower cam device 1 includes a cam holder 100 fixed to a lower die or a pad (not shown) of a press die, a cam slider 200 slidably supported by the cam holder 100, biased in the return direction by a gas spring 103, reciprocating in the processing direction with a predetermined stroke, and attaching a processing tool at a predetermined position in the processing direction, and a cam driver 300 fixed to an upper die (not shown) of the press die and applying a pressing force to the cam slider 200 as the upper die moves up and down.

[0019] The cam holder 100 includes a cam holder body 101, a guide block 102, a gas spring 103, and a stopper plate 104.

[0020] The cam holder body 101 is a member made of a metal material and is mainly formed of cast iron. The cam holder body 101 has an "L"-shaped notch groove portion 101a on the front surface, the stopper plate 104 is assembled on the upper surface, and has an attachment surface 101b for attaching to the lower die or a pad of the press die on the bottom surface. The guide block 102 is assembled in the groove portion 101a.

[0021] The guide block 102 is a member made of a metal material and is a quadrangular prism-shaped member mainly formed of a copper alloy. The guide block 102 has an assembly hole for assembling the gas spring 103 near the center on the axial center of the quadrangular prism, and has an assembly surface for assembling to the groove portion 101a on one surface of the quadrangular prism. Further, fitting grooves for fitting with the slide keepers 202 are provided on both end sides of the assembly surface. The slide keepers 202 assembled on both side surfaces of the cam slider 200 are fitted into the fitting grooves to slidably guide the cam slider 200 in a certain direction.

[0022] Also, a solid lubricant can be embedded in the guide block 102 to reduce the sliding friction with the cam slider 200.

[0023] The gas spring 103 is a component made of metal. The gas spring 103 comprises a cylindrical cylinder body and a piston rod extending axially from one end thereof. The gas spring 103 is used as a return elastic member to return the cam slider 200 to its initial position after machining the workpiece, using high-pressure gas (e.g., nitrogen) sealed inside the cylinder body. A coil spring (not shown) can also be used as the return elastic member instead of the gas spring 103. The coil spring is a helical component made of metal that elastically deforms in response to the load, generating a restoring force, and is used as a return elastic member to return the cam slider 200 to its initial position after machining.

[0024] The stopper plate 104 is a plate member made of metal. The stopper plate 104 is assembled on the upper part of the groove 101a to prevent the cam slider 200 from coming out of the cam holder 100 when the lower cam device 1 is in operation.

[0025] The cam holder mounting surface 101b is a surface for fixing the cam holder 100 to the lower die or pad of a press die, and has knock holes used for positioning relative to the press die and counterbore holes for fastening with fixing bolts. The knock holes are used for positioning by fitting knock pins into them. The counterbore holes have through holes for inserting fixing bolts and counterbore portions for accommodating the bolt heads.

[0026] When the mounting hole positions on the cam holder mounting surface 101b are defined as the front end being the side with the groove 101a and the rear end being the other end, and the direction connecting the front and rear ends of the cam holder 100 is defined as the front-rear direction, and the direction perpendicular to the front-rear direction is defined as the left-right direction, a first counterbore hole is placed near the left rear corner of the mounting surface 101b, a second counterbore hole is placed near the right rear corner, a third counterbore hole is placed near the left front corner, a fourth counterbore hole is placed near the right front corner, a first knock hole is placed near the rear of the third counterbore hole, and a second knock hole is placed near the rear of the fourth counterbore hole.

[0027] The cam slider 200 comprises a cam slider body 201, a slide keeper 202, and a spring stopper 203.

[0028] The cam slider body 201 is a metal component, mainly made of cast iron. The cam slider body 201 has a second contact portion 201a on its front and a machining tool mounting surface 201b on its bottom. Slide keepers 202 are also assembled on the left and right sides. The second contact portion 201a is a notched groove into which the first contact portion 302a abuts. Machining tools for drilling holes or bending the panel material are attached to the machining tool mounting surface 201b.

[0029] The slide keeper 202 is a plate member made of metal. The slide keeper 202 comes in a set of two, with one attached to the left and right sides of the cam slider body 201. One end of the slide keeper 202 is fixed to the cam slider body 201, and the other end has a projection perpendicular to the plate surface. The projection fits into a fitting groove provided in the guide block 102. As a result, the slide keeper 202 maintains the sliding of the cam slider 200 along the guide block 102 and supports the cam slider 200 from the left and right directions.

[0030] The spring stopper 203 is a plate member made of metal. The spring stopper 203 is installed at the rear of the two slide keepers 202 that are assembled to the cam slider 200. The spring stopper 203 is in contact with the piston rod of the gas spring 103 and receives the repulsive force of the return elastic member. After processing, as the cam driver 300 rises, the spring stopper 203 transmits the repulsive force of the gas spring 103 to the cam slider 200, and the cam slider 200 returns to its initial position.

[0031] The cam driver 300 comprises a cam driver body 301 and a forced return plate 302. The cam driver body 301 is a metal component, mainly made of a copper alloy. The upper surface of the cam driver body 301 has a mounting surface 301a for attachment to the upper die of a press mold, and the forced return plate 302 is assembled to the front surface. In addition, a solid lubricant can be embedded in the bottom surface of the cam driver body 301 to reduce sliding friction with the cam slider 200.

[0032] The cam driver mounting surface 301a is a surface for fixing the cam driver 300 to the upper die of the press die, and has knock holes used for positioning relative to the press die, and counterbore holes for fastening with fixing bolts. Positioning is performed by fitting knock pins into the knock holes. The counterbore holes have through holes for inserting fixing bolts and counterbore portions for accommodating the bolt heads.

[0033] When the mounting hole positions of the cam driver mounting surface 301a are defined as follows: the end on which the forced return plate 302 is assembled is the front end, the other end is the rear end, the direction connecting the front end and the high end of the cam driver is the front-rear direction, and the direction perpendicular to the front-rear direction is the left-right direction, then a first counterbore hole is placed near the center of the rear end of the mounting surface 301a, a second counterbore hole is placed near the center of the front end, a first knock hole is placed between the first counterbore hole and the center of the mounting surface 301a, and a second knock hole is placed between the second counterbore hole and the center of the mounting surface 301a.

[0034] The forced return plate 302 is a metal component with a U-shaped cross-section. One end of the forced return plate 302 is attached to the front end of the cam driver body 301, and the other end has a wedge-shaped projection, which is the first contact portion 302a. After machining, as the cam driver 300 rises, the first contact portion 302a contacts the second contact portion 201a of the cam slider body 201, applying an impact force to the cam slider 200. This relieves the jamming of the machining tool and releases the cam slider 200.

[0035] Figure 2 shows the operation of the lower-mounted cam device 1 in this embodiment. Figure 2(a) shows the state of the lower-mounted cam device 1 when the upper die is at the top dead center position (cam slider retracted position, hereinafter simply referred to as the retracted position), and Figure 2(b) shows the state of the lower-mounted cam device 1 when the upper die is at the bottom dead center position (cam slider advanced position, hereinafter simply referred to as the advanced position).

[0036] In the operation of the lower-mounted cam device 1, the cam driver 300 moves downward together with the upper die (not shown) of the mold. The bottom surface of the cam driver 300 contacts the top surface of the cam slider 200, and further, the first contact portion 302a of the forced return plate 302 contacts the second contact portion 201a of the cam slider 200. Subsequently, while being held by the slide keeper 202, the cam slider 200 moves in the machining direction (from the retracted position to the forward position) along the guide block 102 of the cam holder 100. Further downward movement of the upper die causes the machining tool (not shown) attached to the tool mounting surface 201b of the cam slider 200 to move in the machining direction (from the retracted position to the forward position) to perform hole drilling or bending on the workpiece (not shown), such as panel material, installed in the mold. At this time, the first contact portion 302a and the second contact portion 201a maintain contact (position in Figure 2(b)).

[0037] After machining, the cam slider 200 moves along the guide block 102 of the cam holder 100 (from the forward position to the retracted position) as the upper die moves upward. If the machining tool jams into the workpiece and the cam slider 200 does not retract, the first contact portion 302a imparts an impact force to the second contact portion 201a as the cam driver 300 rises. This force causes the cam slider 200 to release the jam and detach.

[0038] Further movement of the upper die returns the cam slider 200 to its original retracted position before machining (position shown in Figure 2(a)).

[0039] Figure 3 shows the relationship between the various forces acting on the lower cam device of this embodiment. The machining angle θ in the figure is the angle that the sliding surface of the cam holder 100 makes with the horizontal plane (a plane perpendicular to the operating direction of the press die; the same applies hereinafter). The machining force F in the figure is the force generated when the cam slider 200 moves forward and protrudes due to the descent of the upper die (not shown), and when the steel plate is punched out by the machining tool (not shown) attached to its tip.

[0040] In the figure, the press force P is the force applied to the lower cam device 1 by the descent of the upper die. In the figure, the component force V is the vertical component force applied to the sliding contact surfaces of the cam holder 100 and the cam slider 200 due to the processing force F. In the figure, the component force Q is the vertical component force applied to the contact surfaces of the cam slider 200 and the cam driver 300 due to the processing force F. In the figure, S is the extrusion stroke of the cam slider 200 in the processing direction. In the figure, S' is the amount of horizontal movement of the cam slider 200 relative to the cam driver 300 (hereinafter referred to as horizontal stroke). In the figure, L is the press stroke from the top dead center to the bottom dead center of the upper die.

[0041] Figure 3 shows the state where the upper die (not shown) has descended by L in the vertical direction (press direction) from the top dead center, and the cam slider 200 has moved by S in the machining direction. At this time, the descent of the upper die applies a pressing force P to the lower cam device 1, and the pressing force P acts on the cam driver 300. A vertical component force Q, caused by the machining force F, acts on the contact surface between the cam slider 200 and the cam driver 300, and this vertical component force Q acts perpendicular to the contact surface. Due to the action of the vertical component force Q, the cam slider 200 is pushed in the machining direction. In addition, a vertical component force V, caused by the machining force F, acts on the sliding contact surface between the cam holder 100 and the cam slider 200, and this vertical component force V acts perpendicular to the sliding contact surface. The machining force F acts in a direction parallel to the sliding contact surface between the cam holder 100 and the cam slider 200, pushing the machining tool (not shown) in the machining direction.

[0042] Furthermore, the relationship between each force and each stroke is expressed by the following equation. The relationship between the pressing force P and the processing force F is: P = F·(1 / sinθ) The relationship between the vertical force component Q acting on the cam slider 200 and the machining required force F is as follows: Q = F·(1 / sinθ) The relationship between the vertical force component V acting on the sliding contact surface between the cam holder 100 and the cam slider 200 and the required machining force F is as follows: V = F·(1 / tanθ) The relationship between the press stroke L and the extrusion stroke S is: L = S·sinθ The relationship between the horizontal stroke S' and the extrusion stroke S is: S' = S·cosθ This is shown.

[0043] Figure 4 is a cam diagram of the bottom-mounted cam device in this embodiment. In the figure, θ represents the machining angle, L represents the press stroke, S represents the extrusion stroke, and S' represents the horizontal stroke. Based on the thickness and tensile strength of the panel to be machined, the press die designer will refer to the cam diagram in Figure 4 to confirm the machining angle and stroke amount of the bottom-mounted cam device and select the type of cam device suitable for the material to be machined.

[0044] Figure 5 shows the dimensions of the bottom-mounted cam device according to this embodiment. H represents the height of the cam device, N represents the length of the cam holder mounting surface, and W represents the width of the cam slider.

[0045] The dimensions of the mounting holes provided on the cam holder mounting surface 101b are as follows: HT1 is the front-to-back distance between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes; HT2 is the left-to-right distance between the center point of the first counterbore hole and the center point of the second counterbore hole; HT3 is the front-to-back distance from the rear end of the cam holder 100 to the center points of the first and second counterbore holes; HK1 is the front-to-back distance from the rear end of the cam holder 100 to the center points of the first and second knock holes; and HK2 is the left-to-right distance between the center point of the first knock hole and the center point of the second knock hole, and the left-to-right distance between the center point of the third counterbore hole and the center point of the fourth counterbore hole.

[0046] The dimensions of the mounting holes provided on the cam driver mounting surface 301a are as follows: DT1 is the front-to-back distance between the center point of the first counterbore hole and the center point of the second counterbore hole; DT2 is the front-to-back distance from the rear end of the cam driver 300 to the center point of the first counterbore hole; DK1 is the front-to-back distance between the center point of the first knock hole and the center point of the second knock hole; and DK2 is the front-to-back distance from the rear end of the cam driver 300 to the center point of the first knock hole. [Examples]

[0047] Table 1 shows the dimensions of the bottom-mounted cam device in the embodiment: cam slider width W, cam holder mounting surface length N, cam device height H, required machining force F, extrusion stroke S, horizontal stroke S', press stroke L, and machining angle θ.

[0048] Example 1 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 119 mm, the height H of the cam device is 140 mm, the required force F for cam processing is 29.4 kN, the extrusion stroke S is 16 mm, the horizontal stroke S' is 10.3 mm, the press stroke L is 12.3 mm, and the processing angle θ is 50°.

[0049] Example 2 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 113 mm, the height H of the cam device is 140 mm, the required force F for cam processing is 34.3 kN, the extrusion stroke S is 16 mm, the horizontal stroke S' is 9.2 mm, the press stroke L is 13.1 mm, and the processing angle θ is 55°.

[0050] Example 3 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 108 mm, the height H of the cam device is 140 mm, the required force F for cam processing is 39.2 kN, the extrusion stroke S is 16 mm, the horizontal stroke S' is 8.0 mm, the press stroke L is 13.9 mm, and the processing angle θ is 60°.

[0051] Example 4 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 101 mm, the height H of the cam device is 140 mm, the required force F for cam processing is 44.1 kN, the extrusion stroke S is 16 mm, the horizontal stroke S' is 6.8 mm, the press stroke L is 14.5 mm, and the processing angle θ is 65°.

[0052] Example 5 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 95 mm, the height H of the cam device is 140 mm, the required force F for cam processing is 44.1 kN, the extrusion stroke S is 18 mm, the horizontal stroke S' is 6.2 mm, the press stroke L is 16.9 mm, and the processing angle θ is 70°.

[0053] Example 6 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 87 mm, the height H of the cam device is 140 mm, the required force F for cam machining is 44.1 kN, the extrusion stroke S is 20 mm, the horizontal stroke S' is 5.2 mm, the press stroke L is 19.3 mm, and the machining angle θ is 75°.

[0054] Example 7 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 80 mm, the height H of the cam device is 140 mm, the required force F for cam machining is 44.1 kN, the extrusion stroke S is 23 mm, the horizontal stroke S' is 4.0 mm, the press stroke L is 22.7 mm, and the machining angle θ is 80°.

[0055] Example 8 shows the relationship when the width W of the cam slider is 60 mm, the length N of the cam holder mounting surface is 74 mm, the height H of the cam device is 140 mm, the required force F for cam machining is 44.1 kN, the extrusion stroke S is 23 mm, the horizontal stroke S' is 2.0 mm, the press stroke L is 22.9 mm, and the machining angle θ is 85°.

[0056] [Table 1]

[0057] Table 2 shows the mounting hole dimensions of the cam holder mounting surface and cam driver mounting surface in Examples 1 to 8.

[0058] In Embodiment 1, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 97 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 98 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0059] In Embodiment 2, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 91 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 92 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0060] In Embodiment 3, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 86 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 87 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0061] In Embodiment 4, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 79 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 80 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0062] In Embodiment 5, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 73 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 74 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0063] In Embodiment 6, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 65 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 66 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0064] In Embodiment 7, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 58 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 59 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0065] In Example 8, the dimensions of the mounting holes on the cam holder mounting surface are as follows: the front-to-back distance HT1 between the center points of the first and second counterbore holes and the center points of the third and fourth counterbore holes is 52 mm; the left-to-right distance HT2 between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm; the front-to-back distance HT3 from the rear end of the cam holder 100 to the center points of the first and second counterbore holes is 14 mm; the front-to-back distance HK1 from the rear end of the cam holder 100 to the center points of the first and second knock holes is 53 mm; and the distance between the center point of the first knock hole and the center of the second knock hole The distance between the center points in the left-right direction, and the distance HK2 between the center point of the third counterbore hole and the center point of the fourth counterbore hole, are 46 mm. The dimensions of the mounting holes on the cam driver mounting surface are as follows: the distance DT1 between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm; the distance DT2 from the rear end of the cam driver 300 to the center point of the first counterbore hole is 12 mm; the distance DK1 between the center point of the first knock hole and the center point of the second knock hole is 28 mm; and the distance DK2 from the rear end of the cam driver 300 to the center point of the first knock hole is 28 mm.

[0066] [Table 2] [Industrial applicability]

[0067] The bottom-mounted cam device according to this invention can be applied to press molding dies in various industrial fields, not just the automotive sector, and can be used as a die unit for processing metal sheet materials. [Explanation of symbols]

[0068] 1: Bottom-mounted cam device 100: Cam holder 101: Cam holder body 101a: Groove 101b: Cam holder mounting surface 102: Guide Block 103: Gas spring 104: Stopper plate 200: Cam slider 201: Cam slider body 201a: Second contact part 201b: Mounting surface for machining tools 202: Slide Keeper 203: Spring stopper 300: Cam Driver 301: Cam driver body 301a: Cam driver mounting surface 302: Forced return plate 302a: First contact part θ: Machining angle

Claims

1. The apparatus comprises a cam holder attached to a lower die or pad, a cam slider slidably positioned on the cam holder, and a cam driver attached to an upper die that drives the cam slider in the machining direction. A forced return plate having a first contact portion is provided at one end of the cam driver, and a second contact portion that can contact the first contact portion is formed on the cam slider body, and when forced return is operated, the first contact portion and the second contact portion come into contact, and a release force is applied to the cam slider via the second contact portion, in a lower-mounted cam device, The lower-mounted cam device is characterized in that the machining angle range of the lower-mounted cam device is 50° or more and 85° or less, and the extrusion stroke range is 16 mm or more and 23 mm or less.

2. The lower-mounted cam device according to claim 1, wherein the maximum allowable processing force of the lower-mounted cam device is 29.4 kN or more and 44.1 kN or less, the horizontal stroke range is 2.0 mm or more and 10.3 mm or less, and the press stroke range is 12.3 mm or more and 22.9 mm or less.

3. The lower-mounted cam device according to claim 1, wherein the width of the cam slider is 60 mm, the length range of the cam holder mounting surface is 74 mm or more and 119 mm or less, and the height of the lower-mounted cam device is 140 mm.

4. The mounting hole arrangement on the cam holder mounting surface is such that the distance in the front-to-back direction between the center point of the first counterbore hole and the center point of the third counterbore hole is 52 mm or more and 97 mm or less, the distance in the front-to-back direction between the center point of the second counterbore hole and the center point of the fourth counterbore hole is 52 mm or more and 97 mm or less, the distance in the left-to-right direction between the center point of the first counterbore hole and the center point of the second counterbore hole is 30 mm, the distance in the left-to-right direction between the center point of the third counterbore hole and the center point of the fourth counterbore hole is 46 mm, the distance in the front-to-back direction from the rear end of the cam holder to the center points of the first and second counterbore holes is 14 mm, the distance in the front-to-back direction from the rear end of the cam holder to the center points of the first and second knock holes is 53 mm or more and 98 mm or less, and the distance in the left-to-right direction between the center point of the first knock hole and the center point of the second knock hole is 46 mm, the lower-mounted cam device according to any one of claims 1 to 3.

5. The mounting hole arrangement on the cam driver mounting surface is such that the distance in the front-to-back direction between the center point of the first counterbore hole and the center point of the second counterbore hole is 63 mm, the distance in the front-to-back direction from the rear end of the cam driver to the center point of the first counterbore hole is 12 mm, the distance in the front-to-back direction between the center point of the first knock hole and the center point of the second knock hole is 28 mm, and the distance in the front-to-back direction from the rear end of the cam driver to the center point of the first knock hole is 28 mm, the bottom-mounted cam device according to any one of claims 1 to 3.

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